"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPW1-FSF : 26 November 2014), Fred S Heisler, 05 Oct 1961; Department of Public Health Services, Sacramento.
Census
"Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTQ3-N1C : 4 April 2020), Fred S Heisler in household of Elizabeth Heisler, Monona, Iowa, United States; citing p. 429, 1895, State Historical Society, Des Moines; FHL microfilm 1,022,085.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M921-7BD : accessed 18 July 2020), Fred S Heisler in household of Elias Holliday, Mapleton Township Mapleton, Monona, Iowa, United States; citing enumeration district (ED) 71, sheet 13A, family 264, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,449.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMV4-7K6 : accessed 18 July 2020), Sam Heisler in household of Elizabeth Holliday, Mapleton, Monona, Iowa, United States; citing enumeration district (ED) ED 20, sheet 4B, line 100, family 110, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 669; FHL microfilm 2,340,404.
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DNA Connections
It may be possible to confirm family relationships with Fred by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: